C++ :

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	int x,sum=0;
	for (int i=1; i<=20; i++)
	{
		cin>>x;
		sum+=x;
	}
	printf("%d\n%.2lf\n",sum,double(sum)/20);
	return 0;
}

Pascal :

var a:array[1..100] of longint;
    i,h:longint;
    p:real;
begin
  for i:=1 to 20 do
    readln(a[i]);
  h:=0;
  for i:=1 to 20 do
    h:=h+a[i];
  p:=h/20;
  writeln(h);
  writeln(p:0:2);
end.